problem with passing variables and array.

PapiSolo

Hi all,

I recently start medling with PHP and so far all I can say is WOW! I'm enjoying it imensely!

i have however come into an obstacle that my newbie brain is having a hard time getting around. The problem is as follows:

I'm programming a psicological experiment for a friend where participants have to look at various images and rate them. (Info is sent to a DB for later analysis)
The first requirement is that the images apear in a random order for each new participant. I created an array with all 21 images/forms (html files), shuffled that array and displayed the file in array[$i] ($i = 0). The participant rates the image, hits the submit button and then...

What i would like is that $_i increment and after displaying the 21 images, all data be evaluated and sent to the DB.

How could I go about doing this. The array and index part. (I'll get the the evaluation and sending to the DB later... 😉)

I've tried sessions, but for some reason it doesn't work.

If some kind soul could point me in the right direction I would really apreciate it. 😉

Cheers,
P.

ezekiel

are you making sure you call session_start() on every page you want to use a session with?

also, if you want to make it as close to random as possible create a userHasSeen array to match it. This way you can add the elements they user has seen and compare the next random number to it. if it has been seen, then create another random number.

PapiSolo

Thanks for your input. I've already managed to get it to work, but I like your useHasSeen sugestion. I will look into implementing that.

As for what was failing im my code, it was a stupi newbie mistake with mixed up variables. (making mistakes is a good way to learn. I won't repeat those to soon 😉 )

mjax

There is no need for a userHasSeen array. Actually, theoretically this could lead to an endless loop in which PHP is searching for an element that has not been seen, but does not find it.

A better solution is to store a shuffeled array in the $_SESSION as well as a pointer, pointing to the current element. On each page just increment this pointer, until all elements are displayed.

PapiSolo

mjax wrote:
A better solution is to store a shuffeled array in the $_SESSION as well as a pointer, pointing to the current element. On each page just increment this pointer, until all elements are displayed.

This is actually the way that I did it. I'm now having some trouble validating whether or not the radio buttons are selected and if not highlighting the invalid area...